Then why not write a blog post and explain these updates and submit it to HN normally, rather than through "Show HN"? I didn't realise Show HN was used for this sort of thing.
(edit) From the guidelines:
> New features and upgrades ("Foo 1.3.1 is out") generally don't make good Show HNs. If you've had a breakthrough, a new Show HN might be ok—just don't do it routinely.